Electrical Eng. 101, [Everything You Shld. Have Lrnd. in by D. Ashby

By D. Ashby

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Actually, that is a very good question. If you dig deep enough you can find RSPs[3] all over the world who debate this very topic. I have no desire to that join that debate (having not attained RSP status yet). So I will tell you the way I see it and think about it so that it makes sense in my head. Since I am just a hick from a small town, I hope that my explanation will make it easier for you to understand as well. 3 RSP= Really Smart Person. As you will soon learn, I do hope to get an acronym or two into everyday vernacular for the common engineer.

Since this is a book on electrical engineering, let's list the fundamental equations for electrical circuits as I see them: Ohm's Law Voltage divider rule Capacitors impede changes in voltage Inductors impede changes in current Series and parallel resistors Thevenin's theorem We will get into these concepts in more detail later in the chapters, but let me touch on a couple of examples. You might say, “You didn't even list series and parallel capacitors. ” Well, you are right, it is fairly basic, but it really isn't at the bottom of the pile.

There are just as many positive as negative charges in both a conductor and an insulator. In a good conductor, the electrons move easily, like liquid water. In a good insulator, the electrons are stuck in place, like frozen water (but not exactly; they don't “melt”). Like charges repel and opposite charges attract. 9 It strikes me that this is somewhat fundamental to human relationships. “Good” girls are often attracted to “bad” boys, and many other analogies that come to mind. 10 There are definitely cases where you can move positive charges around.

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